expired Posted by Skillful_Pickle | Staff • Jun 6, 2025
Jun 6, 2025 4:38 PM
Item 1 of 1
expired Posted by Skillful_Pickle | Staff • Jun 6, 2025
Jun 6, 2025 4:38 PM
4-Pack ECO-WORTHY 48V 100Ah LiFePO4 Batteries + 5KW Hybrid Inverter
+ Free Shipping$3,200
$4,200
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I am in So Cal in a town where the city takes there own cut and thus electricity prices are ridiculous (Real rate calculated by taking bill and dividing by KHw is nearly $0.5 / kWh. I bought panels at 24 panels at $120 / 380 Watts call it $3K for nominal 9120 Watts but my real production is about 7800 peak 85% not bad. I bought an EG4 18KV off a guy who had planned to go off grid and an EG4 battery ~15Kwh battery to go with it for call it $8K. Another $2k in installation costs (12 panels on the flat patio cover needed angle brackets and welded up a angled patio cover on the side of the house for the other 12, some wire, flex, connectors, breaker to tie it to the panel. All in about $13K. Tax incentives cover ~1/3 so real cost is $9K. New california law only pays me $0.038 per KWh and charges me $.50 no wonder all the solar companies are going out of business. No way am I going to put power back into the grid at those prices.
My bill dropped from $400 to $150 / month. (My previous solar install under the old rules did drop to zero with no battery install required since the utility was paying me at the same rate they were charging. I get that there are infrastructure costs, but there is no way that infrastructure costs are 93% of costs. (In fact they publish that generation costs are 60%, pay us 60% and everyone would be happy)
Saving $250 month gives a payoff time of 3 years. This makes sense to me with the crazy rates in this city. It also insulates somewhat from future rate hikes. If your rates are in line with US average (about $.25) the payoff would double to 6 years.
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"The real problem is you DONT want to constantly drain your batteries to low level. This is how they get damaged and die early. You want them to run to maybe 10% and stop. Yes there is a setting in this inverter to stop AC output at certain battery level. But that just means you get even less hours of power to battery."
They're going to degrade from calendar aging much faster than cycling aging. You can run from 100% to 0% daily. Check out Will Prowse's vidio, & the thread on DIY Solar forum on the subject.
At 100% DoD cycling, 1C rate most LFP / lifepo4 batteries can be expected to last ~1250 cycles
At 100% DoD cycling, 1/4C most can be expected to last ~2500 cycles (about what this inverter can provide)
At 60% DoD cycling, 1C most can be expected to last ~3000 cycles
At 60% DoD cycling, 1/4C most can be expected to last ~5000 cycles
2500 full discharge cycles is a lot of cycles. Even if you were a terrible engineer and decided to build a system with absolutely no margin that discharged at 1C (in this case 400A!) you could do this every day for 3 or 4 years before your capacity dropped by just 20%. Since the system described can only provide 5kW (~1/4C) you would get about 7 years. If you did this every day.
Good luck and think like an engineer.
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