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Search took 0.00 seconds. Search: Posts Made By: T1 Terry
Forum: Electrical: Batteries, Generators & Solar 25-05-2014, 11:48
Replies: 185
Views: 47,368
Posted By T1 Terry
Re: MPPT Charge Controller for LifePO4 Batteries

Hmmm.....Caravaners Forum • View topic - MPPT vs PWM "real world" test (https://www.caravanersforum.com/viewtopic.php?f=2&t=47511) This lot of testing cam up with a different result if you read the...
Forum: Electrical: Batteries, Generators & Solar 12-03-2014, 17:46
Replies: 185
Views: 47,368
Posted By T1 Terry
Re: MPPT Charge Controller for LifePO4 Batteries

This is the part most people get confussed with grid tie inverters and low voltage DC to DC MPPT controllers, an MPPT controller can't change volts in to amps.
Watts is the measurement of power, 36v...
Forum: Electrical: Batteries, Generators & Solar 12-03-2014, 04:04
Replies: 185
Views: 47,368
Posted By T1 Terry
Re: MPPT Charge Controller for LifePO4 Batteries

I guess it very much depends where you are at the time. Ice bound winter doesn't really lend itself to thoughts of high temp effect, but over here we are still feeling summers bite and it's a real...
Forum: Electrical: Batteries, Generators & Solar 08-03-2014, 13:55
Replies: 185
Views: 47,368
Posted By T1 Terry
Re: MPPT Charge Controller for LifePO4 Batteries

It is obvious you don't understand much about solar panels. Unless you place the solar panel on ice the STC figure will never be a real world figure so using STC figures for theoretical test results...
Forum: Electrical: Batteries, Generators & Solar 08-03-2014, 04:29
Replies: 185
Views: 47,368
Posted By T1 Terry
Re: MPPT Charge Controller for LifePO4 Batteries

Look at the chart Dave, even at 50 deg C the Vmp is around 15v, how can you get more power out by using a piece of equipment that eats some of the power you are trying to harvest?
If you measure the...
Forum: Electrical: Batteries, Generators & Solar 08-03-2014, 03:55
Replies: 185
Views: 47,368
Posted By T1 Terry
Re: MPPT Charge Controller for LifePO4 Batteries

Interesting graph and highlights what I was saying about the reduced Vmp as the cell temp climbs. at 25 deg c the panel in the graph has an approx Vmp of 17.5v, at 75 deg C the Vmp is down around...
Forum: Electrical: Batteries, Generators & Solar 08-03-2014, 03:17
Replies: 185
Views: 47,368
Posted By T1 Terry
Re: MPPT Charge Controller for LifePO4 Batteries

It's one of those things that can be hard to test. A simple switch between MPPT and PWM controllers and reading the amps going into the battery will only work if the solar panels remain in parallel...
Forum: Electrical: Batteries, Generators & Solar 08-03-2014, 02:05
Replies: 185
Views: 47,368
Posted By T1 Terry
Re: MPPT Charge Controller for LifePO4 Batteries

If you are getting 20% to 25% more because you changed controllers has little to do with it being an MPPt controller and far more likely to be a case of either crap wiring or the previous PWM...
Forum: Electrical: Batteries, Generators & Solar 06-03-2014, 22:58
Replies: 185
Views: 47,368
Posted By T1 Terry
Re: MPPT Charge Controller for LifePO4 Batteries

I'm open to be corrected, have you found MPPT controllers that can do better than a PWM controller once the controllers have moved from the boost mode to absorption or float mode?
With Li...
Forum: Electrical: Batteries, Generators & Solar 06-03-2014, 21:22
Replies: 185
Views: 47,368
Posted By T1 Terry
Re: MPPT Charge Controller for LifePO4 Batteries

The issue is not the fact they stay in bulk mode till they reach 96% to 99% charged, depending on the size of the array and how far up the knee you are prepared to go, it's the inability to get an...
Forum: Electrical: Batteries, Generators & Solar 04-03-2014, 02:09
Replies: 185
Views: 47,368
Posted By T1 Terry
Re: MPPT Charge Controller for LifePO4 Batteries

Haven't been here for a while :whistling: I found the bad side of MPPT controllers far outweighed the good side when I tried using the on Li batteries. The battery voltage is always higher, there is...
Forum: Electrical: Batteries, Generators & Solar 02-01-2014, 17:10
Replies: 185
Views: 47,368
Posted By T1 Terry
Re: MPPT Charge Controller for LifePO4 Batteries

Why do you want to use an MPPT controller if you only have a few hundred watts of solar? Is there a big voltage mismatch, like 24v panels and a 12v system? If not, save the $$ and get a PWM...
Showing results 1 to 12 of 12

 
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