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Adi 22/09/2022
The board arrives in Romania from CN in about one month. The MPPT regulator with CN3722 is operating well. I recommend it as the cheapest MPPT I have found (about 9 USD); its operation is based on constant input voltage (called MPPT voltage). It can be used as it is, but I preferred to modify its heatsink because it is a risk of electrical contact, the insulation is the heatsink black paint only; I made a 3 mm hole in the ground connection under D1 and put an additional heatsink on the top of PMOS and diodes - connect them with a 3 mm screw (photo 1 and 2) - under the original heatsink I used kapton tape and thermal paste. The schematic of the board can be seen on figure 3 with the pin names taken from the CN3722 datasheet (typical circuit - photo 4). The adjustment can be done directly with the solar panel (SP) - adjust V_MPPT to the point where the LED(s) are blinking without battery connected; in this point you get 1.04V (typical) on MPPT terminal, over R5; you can adjust V_MPPT also based on the SP characteristics, to the maximum power voltage (about 15..20% less than the open-circuit voltage) using an additional source (with the current limited to less than 1A) settled to the desired voltage (adjust to get 1.04V over R5 and/or to the LED blinking point, without battery). With the battery connected you can adjust the end of charge voltage to the point where you get 2.416V (typical) to the FB pin - over R7, OR when the battery reach the end-charge voltage adjust to the point where the LEDs change the color - from blue to red (dimmed) in my case - blue is charging, red is end of charge (in my case - normally one expects red for charging...). I tested the panel with low light on a cloudy day (w/o heatsink) with a 100W 22V solar panel, I get about 20% more power compared with the MPPT of the XMUND XD-PS1 power station. I will test it also on a sunny day (with heatsink now) and I will add a comment.
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Q: brushless motor

Asked by BG149179423 on 2022-11-24 05:32:36

Adi ED3 model is brush motor - there are sparks in the rear part produced by the motor collector.

2022-12-03 10:31:19 Helpful (0)
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Adi Inthe schematics there is a small mistake... VCC is connected to S_PMOS point (after M1 - protection to reverse voltage at the panel input).

Adi 22/09/2022
The board arrives in Romania from CN in about one month. The MPPT regulator with CN3722 is operating well. I recommend it as the cheapest MPPT I have found (about 9 USD); its operation is based on constant input voltage (called MPPT voltage). It can be used as it is, but I preferred to modify its heatsink because it is a risk of electrical contact, the insulation is the heatsink black paint only; I made a 3 mm hole in the ground connection under D1 and put an additional heatsink on the top of PMOS and diodes - connect them with a 3 mm screw (photo 1 and 2) - under the original heatsink I used kapton tape and thermal paste. The schematic of the board can be seen on figure 3 with the pin names taken from the CN3722 datasheet (typical circuit - photo 4). The adjustment can be done directly with the solar panel (SP) - adjust V_MPPT to the point where the LED(s) are blinking without battery connected; in this point you get 1.04V (typical) on MPPT terminal, over R5; you can adjust V_MPPT also based on the SP characteristics, to the maximum power voltage (about 15..20% less than the open-circuit voltage) using an additional source (with the current limited to less than 1A) settled to the desired voltage (adjust to get 1.04V over R5 and/or to the LED blinking point, without battery). With the battery connected you can adjust the end of charge voltage to the point where you get 2.416V (typical) to the FB pin - over R7, OR when the battery reach the end-charge voltage adjust to the point where the LEDs change the color - from blue to red (dimmed) in my case - blue is charging, red is end of charge (in my case - normally one expects red for charging...). I tested the panel with low light on a cloudy day (w/o heatsink) with a 100W 22V solar panel, I get about 20% more power compared with the MPPT of the XMUND XD-PS1 power station. I will test it also on a sunny day (with heatsink now) and I will add a comment.
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Adi I verified (for Mensala 2200W) the input voltage up to 31 V and the over-voltage protection does not trigger; in an user manual (that comes with the inverter, for other inverter type anyway...) it is written 20 - 30 V battery voltage as limits of one class of inverters (I assume 24 V type; 10.5 - 15 V, I assume for 12 V type and 40 - 60 V, I assume for 48 V type).

2022-09-06 03:46:49 Helpful (0)
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Adi 02/07/2022
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Q: What is the weight of a panel?

Asked by BG216381736 on 2020-12-29 10:45:46

Adi 2.2 kg

2022-07-04 02:57:51 Helpful (0)
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Q: Hello! Does 5v and 12v ports output simultaneously? Thanks!

Asked by BG141521203 on 2022-07-02 10:56:48

Adi Yes they do work together but with a lower power. In my tests I get in direct evening sun (today, 19:00, a bit foggy) about 5 W maximum power at DC output (without USB, 16.3V x 0.3A). With both USB and DC connected I get: 0.2A x 4.2V = 0.85W at DC output plus 4.7V x 0.13A = 0.6W, total about 1.5W. With USB only I get 4.2V x 0.28A = 1.2W. With full sun I expect more power, I will add a review after the test.

2022-07-04 12:48:25 Helpful (3)
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Q: 100 watts?

Asked by BG511365540 on 2022-05-06 08:23:21

Adi I measured the solar panel with a constant current load with full sun on June 27, 14:00 and I get a maximum power of 6.5 W (13V x 0.52A = 6.5W). Charging the lead-acid battery I get a maximum of 7.3 W (0.52A x 14V = 7.3W). I expected a power less than 20 W anyway (0.1 sqm x 1000 W x 20% = 20 W).

2022-07-04 02:09:31 Helpful (4)
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Adi@BG573744020 The watch stops yesterday... it can be charged but no other operation is valid - seems that the screen cover is broken - poor material - last for 1 year and 2 month... I changed the bracelet 2 month ago (the original ones get broken - the material is sable for about one year...)

Adi 30/10/2018
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