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Search took 0.00 seconds. Search: Posts Made By: Dockhead
Forum: Electrical: Batteries, Generators & Solar 15-02-2017, 02:35
Replies: 88
Views: 22,376
Posted By Dockhead
Re: Hot water with electricity from solar panels

This raises an interesting question -- what kind of load does it take to flip the charger back into absorption?

My Victron Multiplus does not seem to be very eager to do this. Even very heavy...
Forum: Electrical: Batteries, Generators & Solar 14-02-2017, 01:54
Replies: 88
Views: 22,376
Posted By Dockhead
Re: Hot water with electricity from solar panels

This all sounds right to me.

My inspiration for this was those clever fridge controllers which freeze down a cold plate when excess power is available judging from voltage.

I guess the flaw...
Forum: Electrical: Batteries, Generators & Solar 13-02-2017, 03:10
Replies: 88
Views: 22,376
Posted By Dockhead
Re: Hot water with electricity from solar panels

Actually you can corrode the plates with too much absorption time with flooded cells. Overcharging is actually just as harmful as undercharging, with lead acid batteries.

I lost my last set of...
Forum: Electrical: Batteries, Generators & Solar 13-02-2017, 01:24
Replies: 88
Views: 22,376
Posted By Dockhead
Re: Hot water with electricity from solar panels

I wonder if you could feed them DC power? I don't really see why not.

In that case, you wouldn't need an inverter at all, and a variable power-dump load would be a cinch. You'd need a changeover...
Forum: Electrical: Batteries, Generators & Solar 12-02-2017, 03:57
Replies: 88
Views: 22,376
Posted By Dockhead
Re: Hot water with electricity from solar panels

Let me try to help you out here.

The very same 700 watt element (rated at 700 watts @ 230v) becomes a 175 watt element if you feed it with 110v. He is changing the WATTAGE of the element , by...
Forum: Electrical: Batteries, Generators & Solar 11-02-2017, 05:18
Replies: 88
Views: 22,376
Posted By Dockhead
Re: Hot water with electricity from solar panels

You suggested fitting a 12v element. That would require either giving up the existing element, or fitting two, neither of which works for the OP.



Wrong. Now it's clear that you didn't...
Forum: Electrical: Batteries, Generators & Solar 10-02-2017, 11:01
Replies: 88
Views: 22,376
Posted By Dockhead
Re: Hot water with electricity from solar panels

You really didn't understand at all what he is doing.

First of all, it is rarely practical to put a second immersion element in a calorifier -- it needs a boss and it's a an expensive futz. That...
Forum: Electrical: Batteries, Generators & Solar 10-02-2017, 03:04
Replies: 88
Views: 22,376
Posted By Dockhead
Re: Hot water with electricity from solar panels

And this is the other reason -- you lose energy running it through the batteries, so it is more efficient if you reduce the load, like the OP did, so that more of it is covered by power produced...
Forum: Electrical: Batteries, Generators & Solar 10-02-2017, 02:19
Replies: 88
Views: 22,376
Posted By Dockhead
Re: Hot water with electricity from solar panels

Not if you define "power" as % capacity of your batteries. Use it faster, and you will use more for the same result. That's how lead acid batteries work. If you don't know about Peukerts...
Forum: Electrical: Batteries, Generators & Solar 09-02-2017, 06:12
Replies: 88
Views: 22,376
Posted By Dockhead
Re: Hot water with electricity from solar panels

No, his analysis is sound. His approach is clever because using the very same heating element (expensive or impossible to mount dual heating elements in most calorifiers), he has a 4 times smaller...
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