Hello.
Unsure of how to do it. Unable to find a 36VDC to 40VDC input sine inverter to 120VAC output. Already have in hand these components :

- Several 40 VDC, 10A, 400W solar panels, parallelable.
- A plain 2500W continuous to 5000 W peak sine inverter 24VDC nominal input to 120VAC output.

Feeding the inverter with 40VDC from the panel(s) may exceed the maximum input voltage capability. (No reliable chinese specifications published, suspected to be around 30VDC input maximum.)

If a resistor is added at the input of the inverter; would it improve the chances of not releasing smoke ? I have a few 1 and 2 Ohm 100W resistors to play with. Monitoring the inverter DC input to avoid overfeeding is not a problem. (With the resistor and no or little AC load to the inverter, its input voltage would not be limited, right? )

Solarpanel40VDC----------------\/\/\/\/\---------------inverter----------------->120VACload

Would you limit the 40V voltage to 24V another way? -Batteries are not involved-

 

Hello.
Unsure of how to do it. Unable to find a 36VDC to 40VDC input sine inverter to 120VAC output. Already have in hand these components :

- Several 40 VDC, 10A, 400W solar panels, parallelable.
- A plain 2500W continuous to 5000 W peak sine inverter 24VDC nominal input to 120VAC output.

Feeding the inverter with 40VDC from the panel(s) may exceed the maximum input voltage capability. (No reliable chinese specifications published, suspected to be around 30VDC input maximum.)

If a resistor is added at the input of the inverter; would it improve the chances of not releasing smoke ? I have a few 1 and 2 Ohm 100W resistors to play with. Monitoring the inverter DC input to avoid overfeeding is not a problem. (With the resistor and no or little AC load to the inverter, its input voltage would not be limited, right? )

Solarpanel40VDC----------------\/\/\/\/\---------------inverter----------------->120VACload

Would you limit the 40V voltage to 24V another way? -Batteries are not involved-

I hope you have plenty of heatsinks, because limiting 40V to 24V at 40A, 50A , 60A (whatever "several" may mean) is going to dissipate a LOT of heat. Perhaps you could use it to heat your hot water tank?

 

The panel is likely a 24V nominal, 40V maximum with an Pmax point around 30 - 35 V.

The simplest and most effective way to use the components you have is to obtain an MPPT solar controller and a modest battery to serve as ballast. A simpler PWM solar controller would also work but less effectively.

That will limit the solar input to the inverter to 24V and avoid stressing it.

 

Good idea; no shortage of heat sinks. I can use the heating element of an added water heater and get hot water out of it. Or warm the house. Plenty of stovetop heating coils too.

Each panel is 72 cell + 72 cell in parallel, which looks more as a 36V even specs say 49, 40, 36 Voc ! ¿? That is why am doing this post. Does not look like 24V; does not look like 48 V to match. Do not want to risk the inverter. I have 9 panels looking for some action, 6 would suffice.

----> https://www.solarelectricsupply.com/q-peak-duo-l-g5-3-400w-q-cells-144-cell-solar-panel
----> https://www.solarelectricsupply.com/canadian-solar-cs3n-400ms-hikublack-solar-panel
----> https://solarmyplace.com/products/bistar-solar-400w-monocrystalline-144-cell-solar-panel