Can't figure out charger/invert size needed

John Frum · Feb 3, 2022

IP4 said:
The largest individual item is a microwave at 1470 watts AC, but would only run 30 minutes a day.
The mini-split Air Conditioner would run at 1060 watts AC for 10 hours a day in the summer, making it by far my largest consumer.

Your inverter requirements would seem to be quite modest.
However your needs for a solar charge controller are very large.
Whatever hardware you decide on, safety, fault-tolerance and OAM(operations, administration and management) are important considerations.
I also like the Sol-ark hardware especially at the scale you are considering.
Because propane has basically unlimited shelf life, Its good to have a properly sized propane generator for backup.
Also propane appliances can be good.

For batteries, there are good ready made options as well as DIY.

100 amp hours * 51.2 volts = 5120 watt hours
34447 watt-hours / 5120 watt hours = 6.727929688 batteries
So you would need minimum 7 of these

EG4 48V 100AH LiFePower4 Battery

ADD-ON CHARGER DEAL Get the EG4 LiFePo4 Battery Charger for 33% off in cart DESCRIPTION SPECS & MANUAL VIDEOS SHIPPING 48V EG4-Lifepower4 Signature Solar’s premier lithium battery, GYLL, has been rebranded to EG4. You can expect the same great battery with the same top-of-the-line, Tier One, A+...

www.signaturesolar.com

For diy, the popular choice here are 280ah EVE blue prismatic cells
280 amp hours * 3.2 volts = 896 watt hours
34447 watt-hours / 896 = 38.4453125 cells
You would want 48 cells in a 16s3p configuration.
There are 2 vendors on the forum who have a good rep.

How far is your pv array going to be from your living space?
I ask because we had someone recently wanted to trench 500 feet between house and array.

robby · Feb 3, 2022

I would also like to know what your budget is like. There are a lot of options when your willing to go $25-$35K but it gets limited if your trying to do work on a $10K or less budget.

IP4 · Feb 3, 2022

smoothJoey said:
Your inverter requirements would seem to be quite modest.
However your needs for a solar charge controller are very large.
Whatever hardware you decide on, safety, fault-tolerance and OAM(operations, administration and management) are important considerations.
I also like the Sol-ark hardware especially at the scale you are considering.
Because propane has basically unlimited shelf life, Its good to have a properly sized propane generator for backup.
Also propane appliances can be good.

For batteries, there are good ready made options as well as DIY.

100 amp hours * 51.2 volts = 5120 watt hours
34447 watt-hours / 5120 watt hours = 6.727929688 batteries
So you would need minimum 7 of these

EG4 48V 100AH LiFePower4 Battery

ADD-ON CHARGER DEAL Get the EG4 LiFePo4 Battery Charger for 33% off in cart DESCRIPTION SPECS & MANUAL VIDEOS SHIPPING 48V EG4-Lifepower4 Signature Solar’s premier lithium battery, GYLL, has been rebranded to EG4. You can expect the same great battery with the same top-of-the-line, Tier One, A+...

www.signaturesolar.com

For diy, the popular choice here are 280ah EVE blue prismatic cells
280 amp hours * 3.2 volts = 896 watt hours
34447 watt-hours / 896 = 38.4453125 cells
You would want 48 cells in a 16s3p configuration.
There are 2 vendors on the forum who have a good rep.

How far is your pv array going to be from your living space?
I ask because we had someone recently wanted to trench 500 feet between house and array.

Thanks very much! I need to look into assembling the 3.2v 280ah cells. I just learned about those. I like bulding things and I definitely like saving money so I'm going to have to do a deep dive into them on Saturday.

As for location, I'd try to fit as many as possible on top of the cabin. I haven't done the math yet but I doubt I'd be able to fit all of them up there. The rest would be on a stand beside the cabin...I'm guessing less than 25ft but I'd try to keep them as close as possible.

IP4 · Feb 3, 2022

robby said:
I would also like to know what your budget is like. There are a lot of options when your willing to go $25-$35K but it gets limited if your trying to do work on a $10K or less budget.

I'd like to keep it under 20k but I know that's stretching it. My envelope math is looking more like 22-25k. I could go over if I save a little more. I just learned about building the 3.2v 280ah blue cells so I need to look into that and see if building them would be a big savings.

I'd rather wait a little, save, and pay more if it means getting good quality. But of course I don't want to pay much more for something only marginally better.

Can't figure out charger/invert size needed

John Frum

Tell me your problems

EG4 48V 100AH LiFePower4 Battery

robby

Photon Vampire

IP4

New Member

EG4 48V 100AH LiFePower4 Battery

IP4

New Member

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