The last few days I was browsing through some DIY sites to get the basic ideas on how to build customized solar generators. Before delving into these basics, let’s look at the bigger picture: are we going for an off-the-shelf product or are we going to develop our own version by using the basic components of a typical solar generator?
According to the reply we got from Mika this week, the plan is to make use of locally available materials in the target regions instead of supplying the final product from Europe. If so, it is apparent that the task is to come up with a design/prototype that utilizes easy-to-find components that are low-cost whilst maintaining an acceptable level of efficiency.
In my opinion, our solar generator model needs to have at least the following basic components:
1. Solar charger (solar panel with built-in battery)
Points to consider – its physical dimension, rated output voltage (12V DC, 16V DC or 24V DC?), rated output power (150W?), short circuit protection (should come with the system), cabling (for connection to the inverter) …
Points to consider – input voltage range (10-15V DC, 10-24V DC?), rated power (150W? needs to be compatible with the solar charger), rated output AC voltage (230V AC), cabling (to the solar charger [DC input] and also to the power distribution terminals [AC output]), AC short circuit protection & DC reverse polarity protection (should come with the system) …
Points to consider – protection class (IP class), installation type (fixed or mobile), ventilation (for the inverter, which dissipates significant heat) …
The NSN GAP (GSM Access Point) set-up shows two equipments (UPS & 48V DC rectifier) connected to the generator. Hence, socket points (distribution board?) are needed, perhaps with protection? …
Is it required to monitor the levels of AC voltage/current & DC voltage/current? May be already integrated with the inverter; otherwise, separate meters needed? …
In principle, the generator in the NSN GAP scheme shall feed (at the minimum) the Flexi EDGE BTS and the PC (computer). In the case of the BTS, the generator first feeds the 48V DC rectifier (which converts 230V AC to 48V DC). Then, the rectifier feeds 48V DC to the BTS and it also charges a 48V battery system, which is a backup source for the telecom equipment.
We need to know the total consumption of the NSN package in order to determine the type of devices that can be connected to the extra available power from the solar generator.
Obviously there will be more points to consider but let’s explore these for now!
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