I have recently acquired a 100Watt 319VDC (429VOC) flexible solar panel which I would like to use on my boat. I may buy more of these panels if I can find an affordable way to use them

The cost of high voltage MPPT controllers is prohibitively expensive with the Xantrex 80-600 at $1300 being the only one available that I know of....Therefore I was considering the following possiblities:

1. Go through a 230VAC UPS (UK model). "AC", input is quoted as 230V "RMS". That means a (sine wave) peak value of 230 x 1.414 Volts which is approx 325Volts. AC enters the SMPS through a filter and is rectified (turned to DC) and that voltage (325-ish minus a couple of volts across the rectifier) is stored on a "reservoir" capacitor. An input of 325V "DC" would amount to the same thing. Although perhaps the 429VOC would be a bit too overwhelming for the UPS which is designed for 230VAC UK mains power?

2. Use an invertor able to take this high dc voltage and convert to 230VAC UK mains voltage. Charge batteries from mains power. But is there a charge controller for the batteries which will run off of 230VAC?

3. Find a switch mode power supply able to convert 320VDC to 48VDC. So far I have not found any at an affordable price.

4.Cut the panels into 4 pieces and wire in parallel producing 80VDC. Use the cheaper 100V MPPT's.

What would people suggest?

The cost of high voltage MPPT controllers is prohibitively expensive with the Xantrex 80-600 at $1300 being the only one available that I know of....Therefore I was considering the following possiblities:

1. Go through a 230VAC UPS (UK model). "AC", input is quoted as 230V "RMS". That means a (sine wave) peak value of 230 x 1.414 Volts which is approx 325Volts. AC enters the SMPS through a filter and is rectified (turned to DC) and that voltage (325-ish minus a couple of volts across the rectifier) is stored on a "reservoir" capacitor. An input of 325V "DC" would amount to the same thing. Although perhaps the 429VOC would be a bit too overwhelming for the UPS which is designed for 230VAC UK mains power?

2. Use an invertor able to take this high dc voltage and convert to 230VAC UK mains voltage. Charge batteries from mains power. But is there a charge controller for the batteries which will run off of 230VAC?

3. Find a switch mode power supply able to convert 320VDC to 48VDC. So far I have not found any at an affordable price.

4.Cut the panels into 4 pieces and wire in parallel producing 80VDC. Use the cheaper 100V MPPT's.

What would people suggest?

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