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Old 24-09-2018, 05:49   #16
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Re: Solar and the isolator

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Yes.

To the extent the drop was bringing bank voltage below its mfg spec, then the more significant the impact.

Best to shoot for 1% drop, but with very fat cabling over long runs it can get so unwieldy or expensive, that a B2B becomes more practical.
John does this affect the amps being delivered to the bank as well aor ust the voltage ,or are they always linked
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Old 24-09-2018, 06:37   #17
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Re: Solar and the isolator

I do not exactly know what you mean by Amps.

The Voltage drop stems from the resistance of the wire and the resistance of the semiconductors / diodes or FET. They are in series in one circuit so the Amps are equal at all points in a circuit I1 = I2 = I3. The voltages summ up V= V1 + V2 + V3.

In parralel circuits the Amps are split per circuit and the Voltages are equal for all branches. so I = I1 + I2 + I3, V = V1 = V2 = V3.

Does it makes sense?

The voltage drop causes losses of power, of the amount P = I * Vdrop, that is then the heat you can feel on the cable or on the heat sink of the semiconductors, and this power does not reach your battery. That is why if you use thicker wires, your battery charges faster.

Hope this clarifies why a high Voltage drop is not desirable.
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Old 24-09-2018, 08:15   #18
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Re: Solar and the isolator

By amps I meant the amphere that is being prduced by altenator . Please excuse the dropped etters I have a callus on my thumb that the touch screen does nt always recognize. I learned he to load pictures so I can show the damage on the isolator Click image for larger version

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Old 24-09-2018, 13:02   #19
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Re: Solar and the isolator

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John does this affect the amps being delivered to the bank as well aor ust the voltage ,or are they always linked
Higher voltage allows more amps to flow into charging the battery, therfore charges more quickly.

Say your batt is spec'd to be Full 100% SoC at 14.7V until trailing amps drops to 1.5A.

If it only receives 14.4V, getting to 100% will take a lot longer and in fact you aren't able to measure the endAmps point properly.
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Old 24-09-2018, 13:04   #20
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Re: Solar and the isolator

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By amps I meant the amphere that is being prduced by altenator
But how much of that makes it to the bank is what's important

A high resistance connection (thinner wire, too many joins, bad crimps, corrosion, etc) turns more current into heat.

So keeping voltage from dropping is how to ensure the batts are getting charged properly.
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Old 24-09-2018, 14:10   #21
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Re: Solar and the isolator

That diode splitter box is cracked due to overheating. Check your alt and shorepower voltages. Diode splitters are fine -provided- you have an adjustable reg on the alt/s to compensate for the voltage they use. Everyone should make certain that the voltages received by their batts during charging is as the manufacturer recommends for that specific model of battery. IMO one of the single best things most can add, is a decent adjustable regulator.
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Old 24-09-2018, 15:38   #22
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Re: Solar and the isolator

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That diode splitter box is cracked due to overheating. Check your alt and shorepower voltages. Diode splitters are fine -provided- you have an adjustable reg on the alt/s to compensate for the voltage they use. Everyone should make certain that the voltages received by their batts during charging is as the manufacturer recommends for that specific model of battery. IMO one of the single best things most can add, is a decent adjustable regulator.
Thanks Matt , we have the 614 balmars hooked up and set for the fire fly house bank which I beleave is 14.7 and float less than 13.2 not sure what is was before
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Old 24-09-2018, 15:40   #23
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Re: Solar and the isolator

Why would shore power go through the isolator
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Old 24-09-2018, 16:00   #24
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Re: Solar and the isolator

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That diode splitter box is cracked due to overheating.
Toss it.

Diode splitters are fine -provided- you have an adjustable reg on the alt/s to compensate for the voltage they use.

No, the difference will vary with fluctuations in current.

Obsolete tech, replace with any of hundreds of choices without any significant voltage drop.

> Everyone should make certain that the voltages received by their batts during charging is as the manufacturer recommends for that specific model of battery.

Yes

> IMO one of the single best things most can add, is a decent adjustable regulator

Yes
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Old 24-09-2018, 16:05   #25
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Re: Solar and the isolator

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fire fly house bank which I beleave is 14.7 and float less than 13.2
No FF should be set lower for longevity, 14.4V absorb setpoint

Yes temp compensated

Drop to float of 13.2V is good, but only after hitting their endAmps spec, usually 4-6 hours of absorption.
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Old 03-10-2018, 02:27   #26
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Re: Solar and the isolator

Just a note to those who responded to me . I have decided to go with two Victron Argofet isloators (smac999) and a Blueseas busbar to combine the output . I decided to go this route for a couple of reasons the biggest being that the existing wiring will work and I can do it myself. I am not yet comfortable with the complexity of the ACRs and all that .
The system worked before with an isolated and will be a bit better this time . Thanks for your help
David
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Old 03-10-2018, 05:27   #27
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Re: Solar and the isolator

Not arguing great choice.

Just did not want to leave the perception that VSR / ACR is in any way complicated.

Besides potentially being cheaper, the othe advantage is they can open based on the charge source being on either circuit, aka two-way charging.

But sometimes one-way is exactly what a system's design calls for.
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Old 03-10-2018, 06:45   #28
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Re: Solar and the isolator

By the timw I purchased 3 battery switches ,2 Acrs and the cable and end fittings and the labour to make the cables as I dont have gear that big it was a wash. The isolators are about 135 usd and require only the cable to the busbar .
John here is a question . Do I even need a bus bar ? Theoretically I could Just jump the two isolators output to output could I not ?
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Old 03-10-2018, 09:41   #29
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Re: Solar and the isolator

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By the timw I purchased 3 battery switches ,2 Acrs and the cable and end fittings and the labour to make the cables as I dont have gear that big it was a wash. The isolators are about 135 usd and require only the cable to the busbar .
John here is a question . Do I even need a bus bar ? Theoretically I could Just jump the two isolators output to output could I not ?
sure, no problem. bus bar is overestimated for two connections.
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Old 03-10-2018, 11:19   #30
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Re: Solar and the isolator

Thanks Cat New be that’s what I thought
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