|
|
Post by kris on Feb 17, 2021 15:57:37 GMT
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Feb 17, 2021 17:59:43 GMT
Only a quick glance but this seems to be something you would use on a grid-tied PV system with multiple modules/panels.
I don't see how it would work on a boat which is not connected to, and able to feed, the main electricity grid.
It appears to be referring to direct AC out which we don't use on boats as we have DC battery storage systems.
Like I said I didn't look at it very carefully maybe got wrong end of stick.
|
|
|
|
Post by kris on Feb 17, 2021 18:50:08 GMT
Only a quick glance but this seems to be something you would use on a grid-tied PV system with multiple modules/panels. I don't see how it would work on a boat which is not connected to, and able to feed, the main electricity grid. It appears to be referring to direct AC out which we don't use on boats as we have DC battery storage systems. Like I said I didn't look at it very carefully maybe got wrong end of stick. This was my initial response as well. Surely it would be an inefficient way of charging batteries. Dc-Ac-Dc. |
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Feb 17, 2021 18:57:27 GMT
Reading the link, I can see the possible advantages of 'micro' power optimisers. Numpty/tripe spreading person here so could be wrong.
|
|
|
|
Post by tonyb on Feb 17, 2021 19:28:18 GMT
If each is producing AC and they seem to be in parallel how do they synchronise and stay in phase?
|
|
|
|
Post by Telemachus on Feb 17, 2021 19:56:06 GMT
If each is producing AC and they seem to be in parallel how do they synchronise and stay in phase? There are ways of doing that. Adding another ac source to an existing one is a matter of pushing the phase forwards slightly. In exactly the same way as a Combi tracks the phase and frequency of the incoming mains and thus can "power assist" by pushing the phase forwards slightlly if the demand is more than the set AC input current, or when the shore power stops and the inverter takes over instantly without any glitch in phase or frequency. In the case of these micro-inverters, perhaps there is some protocol whereby one of them sets the phase and frequency, and the others match it. |
|
|
|
Post by Telemachus on Feb 17, 2021 19:56:56 GMT
Seems to me that having an MPPT controller for each panel is what would suit a boat. Perfectly feasible, but fairly expensive.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Feb 17, 2021 20:16:30 GMT
Seems to me that having an MPPT controller for each panel is what would suit a boat. Perfectly feasible, but fairly expensive. I put 3 reasonably large PV modules on top of the boat last year. A 365w @36v nominal and a pair of 325w units at same voltage. The 365 goes through a Victron MPPT to a small (60ah) 12v LFP battery bank and the other two I wired as 72v nominal through another Victron to a different 60ah LFP battery bank. I did wonder whether 72v or 36v was better or whether to have seperate controllers for each PV module but it doesn't seem to be needed. I reckon for larger arrays it would get interesting but for the limited number you can get on a reasonably small inland boat it might not be relevant. Bearing in mind that in winter you are unlikely to get a significant amount of power from solar anyway so if you are a high consumer it's not worth trying. Just use an internal combustion engine system instead for the darker months. Once the weather gets brighter there will be surplus in all but the most meagre of PV installs on boats. |
|
|
|
Post by quaysider on Feb 19, 2021 20:28:12 GMT
When I had the solar array put on the bungalow roof, 3 out of 4 Installers were trying to sell the virtues of having micro-inverters because of the differential in light hitting the panels - they are 10 on one side (south facing) and 5 on south west - they would have changed the price from circa 4k up to 8... being a Yorkshire man, I went with the 1 man band firm around the 5 k mark. The actual stats produced in the forecasts for with / without micro inverters were not much different - and the ACTUAL figures I've had have been higher than both sets of forecasts... ergo, I'm glad I trusted my gut rather than the sales patter.
|
|
|
|
Post by Jim on Feb 20, 2021 15:42:28 GMT
When I had the solar array put on the bungalow roof, 3 out of 4 Installers were trying to sell the virtues of having micro-inverters because of the differential in light hitting the panels - they are 10 on one side (south facing) and 5 on south west - they would have changed the price from circa 4k up to 8... being a Yorkshire man, I went with the 1 man band firm around the 5 k mark. The actual stats produced in the forecasts for with / without micro inverters were not much different - and the ACTUAL figures I've had have been higher than both sets of forecasts... ergo, I'm glad I trusted my gut rather than the sales patter. We fitted ours early on at the start of the scheme, best investment we made. Now all paid for and a 9% return tax free for the next 10 years. |
|
|
|
Post by phil70 on Feb 21, 2021 8:21:02 GMT
Bump
Phil
|
|
|
|
Post by Jim on Feb 21, 2021 10:01:00 GMT
A quick chorus of Hands Knees and.... |
|
