mppt vs pwm

smkettner wrote:
I can't wait for Piano to show you how to balance all those batteries together ;)

X2

BTW If you go with a 24V battery setup the MS controllers will handle double the wattage.

Air conditioning, 1920 Amp hours. Now we are talking level up. :B

I can't wait for Piano to show you how to balance all those batteries together ;)

Actually with that battery I would go 24 volts or even 48 volts on the battery to reduce the cabling size and controller size requirements. Twice the volts = half the amps through the controller, inverter and battery wire. Does not help with the alternators.... but still tempting.

Bedlam,

With those batteries you appear to be beyond the pastie panels. I just installed 3X250W, MPPT60 and remote for $1500 for everything including wiring and mounting. A fourth series/parallel flat panels will give you 60A.

The panels were $200 which I picked up as shipping is expensive.

Sounds like your trailer might handle even larger sized panels (physical and wattage). Suggest you figure out how much power you need and possible upgrades.

Sweet deal on the batteries!

On using the Eco-w's in parallel. I started doing it because my panels were mismatched, otherwise I would have bought the Rogue 30a back then. I can use three systems to run the little AC but I don't intend to install like that. Whatever gets mounted will be run by a larger controller, not multiple Eco-w's. That's too much wiring, fusing, switching and too few features to deal with the extreme temps in storage. (-20f TO 105f)

Some of the batteries will charged via the dual 220A alternators and live on the truck. The rest will be charged by solar in the trailer. This will be a distributed power system - Plenty of things for me still to learn.

I was supposed to get used damaged welding cable from a friend, but it has been in high demand at the workplace and I only will get the scraps left behind. I hope this will be my wire source.

1920 Ah's, sweet! You may need to bump up your solar a little, though. :)

(I hope they've all been kept fully charged).

Used but still functional and yes, FREE!

Bedlam wrote:
These are 80Ah AGM 24HR3000 at my disposal:

Wos, nice score... were they all free?

smkettner wrote:

jrnymn7 wrote:
Putting 45a into a 215Ah bank, it will remain in bulk until ~80% soc. A 50-80% would take about an hour and a half; voltage slowly rising from about 13v to 14.8v over that time period. Putting 45a into a 430Ah bank, it would remain in bulk until well past 80% soc, voltage slowly rising all the while. The only way to get to 14.8v rather quickly would be to use a very high C-rate, like 75a on a 215Ah bank.

You assume you get 45 amps at daybreak... you don't. Amps ramp up slowly with the sun and often can be at 14.8 before max output is even available.

To really get max, the battery needs to be a bit oversize or you need cloud cover to about 11am. Then with sudden clearing and full sun you will get max power into a low battery.

Hard pressed sometimes to even get down to 50% because each day you are closer to 95% to 98%+. So the 50-80 becomes 68-98 and you hit that 80% fairly quick.

I'd say this is a very good daily goal to have, battery capacity wise and solar panel and charge controller wise. Easy on battery longevity also.