Regular readers of this blog will know I am aiming to charge all
electrical devices on Arwen in a sustainable manner using a combination of
power banks and a portable solar panel charger. Previous posts on charging small electronic devices whilst dinghy cruising can be found by accessing the menu on the right - June 2019.
The charger I bought was the Big Blue 5V 28W solar charger – which came top in many online review sites.
The charger I bought was the Big Blue 5V 28W solar charger – which came top in many online review sites.
It helped that the price had fallen by £20 in a flash sale on Amazon as
well – so I managed to get it for around £40. Right time, right place – it rarely
happens for me.
I have tried the panel once so far and was impressed. In partially
cloudy conditions it charged the phone up 15% in just under an hour – supplying
an average v amperage throughout that time. I have nothing to compare this
with but I felt it was fast and efficient. Accompanying literature suggests it
has an amazing 21% to 23.5% solar efficiency.
POSTSCRIPT update - today in fairly sunny conditions it charged the phone up 50% in just under an hour and three quarters.
POSTSCRIPT update - today in fairly sunny conditions it charged the phone up 50% in just under an hour and three quarters.
It comes with two USB out-ports but based on this initial test in
partially cloudy conditions, I’m thinking it is probably best to use one port
at a time rather than two simultaneously – so that you get maximum charging
efficiency to a device. I know it contains a chip which assures a stable charge
rate.
The Big Blue comes with an auto restart and charge interruption recovery
function (so if a cloud passes over the sun, or if the sun angle changes to
cause a temporary shadow on the panels - it starts recharging when the sun
reappears) and a very cool integrated digital ammeter. Hence, I know what
amperage was being produced.
The pack seems durable – a Cordura outer rucksack like material which
should stand up to abrasion forces and it comes with four small carabineer
hooks and a USB micro cable. You will need other cables for digital cameras and
GoPros etc – but the panel will charge most of these devices. The carabineers
hook to four eyelets so that it can be hung in various positions off rucksacks
etc. There is a pocket for the device you are charging but in many reviews, it seems
that your device could overheat in the pocket in the full sun and therefore the
best option was to get a longer USB cable and keep the charging device in the
shade in a bag.
The actual panels themselves are Sunpower panels and these seem to be
generally regarded as the best.
Overall this seems to be a simple, uncomplicated charger and I’m already
liking it just from initial tests. It will lie across my saddle bags, across
one of Arwen’s thwarts or dangle from my 30 Lt day sack. It also comes with a two
year warranty as well.
What are the cons? Well it is a bit big and bulky – not massively so –
just over the weight of an Ipad I guess. On the kitchen scales it is weighing
in at 22 ounces. Of course, this is a trade off as the larger the panel the
more efficient it is but the heavier it will be. It isn’t fully waterproof (to
IPX4) but is splash proof which is fine.
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