Confused

I have 4-100 watt panels. Panel 1 - 100 watt, vmp 18v, imp 5.56, voc 22.0, isc 5.96.
Panel 2,3,4 - 100 watt, vmp 17.5, imp 5.72, voc 21.08, isc 6.22
I believe I have it connected as a 12 volts system in my mind.
All these panels are connected in parallel. The wires from each panel are 12 gauge connected to 10 gauge going into a housing with a buss bar that is connected to 4 gauge wire running approximately 25 feet to my garage to connect to the inverter. All the panels are earth grounded together and to a earth grounding rod. The panels are facing due South and have no sunlight blockage. I get sunlight from 8 am till right now 7 pm central time here in Tennessee. My panels are tilt able. My question is I keep burning up 1000 watt grid tie inverters. I don't know if its a electrical issue or what the problem is. Any help would be greatly appreciated. Thanks!

jzw said:

... I keep burning up 1000 watt grid tie inverters...

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As in they catch fire, or just stop working? How long does it take? All the same type of inverter or different brands?

Do you have a solar charge controller (SCC)? Usually, the panels are connected to the SCC and the inverter to the battery... something like this:

svetz said:

As in they catch fire, or just stop working? How long does it take? All the same type of inverter or different brands?

Do you have a solar charge controller (SCC)? Usually, the panels are connected to the SCC and the inverter to the battery... something like this:

Click to expand...

No they don't catch fire they just die with in a few months. They stop output of current. No, 2 were the same brand but the last one fried a transformer in the unit. I go straight to the grid. No. battery at all. But I believe I know why they are tearing up. I get alot of power outages and power spikes and I believe this is causing the issue. Do you know of a protection device that would safe guard with power outages and when the power comes back on to stop the initial surge of power spikes?

jzw said:

No they don't catch fire they just die with in a few months. They stop output of current. No, 2 were the same brand but the last one fried a transformer in the unit. I go straight to the grid. No. battery at all. But I believe I know why they are tearing up. I get alot of power outages and power spikes and I believe this is causing the issue. Do you know of a protection device that would safe guard with power outages and when the power comes back on to stop the initial surge of power spikes?

Click to expand...

I have 4-18volt, 100 watt panels. VMP 18.5volts, IMP 5.56, VOC 22.0, ISC 5.96

jzw said:

Do you know of a protection device that would safe guard with power outages and when the power comes back on to stop the initial surge of power spikes?

Click to expand...

What I do is have a time 120V time delay relay that de-enregizes when the grid goes down. Then after the grid comes back up, the time delay starts and then reconnects the line. I use this to protect other devices, but it would work just as well for one of those grid-tie inverters.

One like this (needs an 8 pin socket).

jzw said:

... I believe I know why ...I get alot of power outages and power spikes a...Do you know of a protection device ... to stop the initial surge of power spikes?

Click to expand...

Midnight & delta SPDs have thumbs up from users, see https://diysolarforum.com/threads/surge-protection.19/