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System: (9) Hanwa QPeak 330W panels in 3S3P, Epever Tracer 10420 150v charge controller, Sungoldpower 6000w 48v inverter, TechDirectClub 14kw 48V Nissan Leaf G2 battery pack (contains four separate 7-pack 48v modules).
House is a vacation home with an off-grid setup down in Baja California.
Two years ago (2019) I changed the electrical on the house from a 12v lead acid setup to what I listed above. The house does not get used June-September and someone is there maybe 10 days a month from Oct-May. System had been working fine during those two years.
A month ago someone was at the house and the power was cycling every 20 minutes. When I say cycle, the whole house loses power for about a split second and then it comes back on. The main power draw is a full size refrigerator, LED 48" TV, and some LED lights and occasionally two ceiling fans. No big power draws like an a/c unit. I thought maybe one of the Leaf modules was bad so I came down to investigate. I have six spare Leaf modules, so I measured the voltage across all 28 modules and all were at 8.33v except five were 8.26v-8.27v. I moved modules around so three of the four packs had 8.33v modules across all seven and with the last pack I added five spares which were reading 7.77v to two 8.31v modules.
Since I moved modules around and only had three of the four packs in use, the power resets now happen every 1.5 hours rather than every 20 minutes. I thought maybe the inverter was getting too hot so I have a floor fan blowing on it constantly, but it is still cycling. At night, it only cycled twice, once at 11pm and again around 6am.
I'm trying to determine if I have a bad inverter or a bad battery. I talked to a sales rep at windandsolar.com and he said inverters either work or don't work and if I have a cycling issue, it is likely battery related.
If all modules measure 8.33v that are in use, how can I tell if it's a battery issue? When a cycle happens and I measure all the modules, they all are at 8.33v.
In the back of my mind, I wondered how long these used Leaf modules would actually last since they are used. The rest of the system is made of new parts. I thought measuring the voltage would help identify the problem but I've run out of ideas at this point. We spent $3k on the batteries and after talking with windandsolar.com, I'll need to spend $10k for an equivalent ~14kw Simpliphi Lithium setup.
House is a vacation home with an off-grid setup down in Baja California.
Two years ago (2019) I changed the electrical on the house from a 12v lead acid setup to what I listed above. The house does not get used June-September and someone is there maybe 10 days a month from Oct-May. System had been working fine during those two years.
A month ago someone was at the house and the power was cycling every 20 minutes. When I say cycle, the whole house loses power for about a split second and then it comes back on. The main power draw is a full size refrigerator, LED 48" TV, and some LED lights and occasionally two ceiling fans. No big power draws like an a/c unit. I thought maybe one of the Leaf modules was bad so I came down to investigate. I have six spare Leaf modules, so I measured the voltage across all 28 modules and all were at 8.33v except five were 8.26v-8.27v. I moved modules around so three of the four packs had 8.33v modules across all seven and with the last pack I added five spares which were reading 7.77v to two 8.31v modules.
Since I moved modules around and only had three of the four packs in use, the power resets now happen every 1.5 hours rather than every 20 minutes. I thought maybe the inverter was getting too hot so I have a floor fan blowing on it constantly, but it is still cycling. At night, it only cycled twice, once at 11pm and again around 6am.
I'm trying to determine if I have a bad inverter or a bad battery. I talked to a sales rep at windandsolar.com and he said inverters either work or don't work and if I have a cycling issue, it is likely battery related.
If all modules measure 8.33v that are in use, how can I tell if it's a battery issue? When a cycle happens and I measure all the modules, they all are at 8.33v.
In the back of my mind, I wondered how long these used Leaf modules would actually last since they are used. The rest of the system is made of new parts. I thought measuring the voltage would help identify the problem but I've run out of ideas at this point. We spent $3k on the batteries and after talking with windandsolar.com, I'll need to spend $10k for an equivalent ~14kw Simpliphi Lithium setup.
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